Pause but he has it at the end (8)
I believe the answer is:
hesitate
'pause' is the definition.
(synonyms)
'he has it at the end' is the wordplay.
'he has' becomes 'hes' (he's).
'end' says to take the final letters.
The final letter of 'the' is 'e'.
'hes'+'it'+'at'+'e'='HESITATE'
'but' acts as a link.
(Other definitions for hesitate that I've seen before include "Dither indecisively" , "Hold back in doubt" , "Pause, waver" , "Dither, waver" , "He who does it may be lost" .)