Uncertain, decide about a time to commit (8)
I believe the answer is:
dedicate
'commit' is the definition.
(I know this)
'uncertain decide about a time' is the wordplay.
'uncertain' indicates anagramming the letters.
'about' is an insertion indicator.
'time' becomes 't' (abbreviation).
'decide' with letters rearranged gives 'dedice'.
'a'+'t'='at'
'dedice' going around 'at' is 'DEDICATE'.
'to' is the link.
(Other definitions for dedicate that I've seen before include "Inscribe or give over to" , "Devote (to), pledge (to)" , "Devote, address, to" , "Devote to a sacred person or use" , "Devote to a special purpose, say time or energy" .)