Felix's short sleep? (6)

I believe the answer is:

catnap

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'sleep?' is the definition.
(I know that catnap is a type of catch some Z\\u0027s)

'felix's short' is the wordplay.
'felix' becomes 'cat' (I've seen this in other clues).
'short' becomes 'nap' (I can't justify this - if you can you should give a lot more credence to this answer).
'cat'+'nap'='CATNAP'

Can you help me to learn more?

(Other definitions for catnap that I've seen before include "Kip" , "(Tom's) snooze?" , "go out briefly" , "Brief doze" , "Drop off" .)

I've seen this clue in The Telegraph.

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