Sparkle and he’s in trouble (5)
I believe the answer is:
shine
'sparkle' is the definition.
(I know that sparkle is a more specific form of the action shine)
'he's in trouble' is the wordplay.
'trouble' indicates anagramming the letters.
'hes'+'in'='hesin'
'hesin' with letters rearranged gives 'SHINE'.
'and' acts as a link.
(Other definitions for shine that I've seen before include "Lustre" , "Direct (a torch) somewhere" , "Radiate or excel" , "Mislaying" , "Give out light; polish" .)