Sadly no, there is no way to just hold it.
This has been asked a lot over the years, do a search to find the relevant rules quote, I'm on my phone or i would link it.
When adding new levels of an existing class or adding levels of a new class (see Multiclassing, below), make sure to take the following steps in order. First, select your new class level. You must be able to qualify for this level before any of the following adjustments are made. Second, apply any ability score increases due to gaining a level. Third, integrate all of the level's class abilities and then roll for additional hit points. Finally, add new skills and feats.
Until you do all those things you will stay at 9th... So nope.
The only way you could achieve that would be to take a feat at level 9 and to use the Retraining rules in Ultimate Campaign to replace it with the feat you want to take at level 10.
The gold cost shouldn't be too prohibitive for a level 10 character (unless your GM is prone to not giving you enough gold) but Retraining takes a high number of days (5 IIRC) in which you can't do anything, so you would need to talk with your GM to see if he could waive off the days or maybe give a week downtime to the party.
By RAW, no.
You could talk to your GM about it, though; I typically allow it.
As others have mentioned, by strict RAW you can't hold feats. Retraining is an option - although to be honest if a player approached me about doing this through retraining I'd probably just let them hold the feat and skip the retraining; going through a level sans a feat would be 'payment' enough.