Wait in the same place endlessly (4)
I believe the answer is:
bide
'wait' is the definition.
(I've seen this before)
'in the same place endlessly' is the wordplay.
'in the same place' becomes 'ibidem' (synonyms).
'endlessly' means to look at the middle letters (the ends of the words are removed).
The middle of 'ibidem' is 'BIDE'.
(Other definitions for bide that I've seen before include "Remain (archaic)" , "To - one's time is to wait for the right opportunity" , "Stay (obs.)" , "Stay in a certain place" , "Remain; await (time)" .)