Pa can’t somehow snooze for a while (6)
I believe the answer is:
catnap
'snooze for a while' is the definition.
(to catnap is to take a short sleep)
'pa can't somehow' is the wordplay.
'somehow' indicates an anagram.
'pa'+'cant'='pacant'
'pacant' anagrammed gives 'CATNAP'.
(Other definitions for catnap that I've seen before include "little snooze" , "For a rest" , "Short sleep" , "(Tom's) snooze?" , "Brief time out" .)