Stipulating about end (3)
I believe the answer is:
tip
'end' is the definition.
(tip is a kind of end)
'stipulating about' is the wordplay.
'about' indicates the answer is hidden within the clue.
'TIP' can be found hidden inside 'stipulating'.
(Other definitions for tip that I've seen before include "given gratuitously" , "Dump; extremity" , "Grtatuity" , "Pointed extremity" , "Empty" .)