Look for building that can accommodate any number (4)
I believe the answer is:
hunt
'look for' is the definition.
(thesaurus)
'building that can accommodate any number' is the wordplay.
'building' becomes 'hut' (I've seen this before).
'that can accommodate' is an insertion indicator.
'any number' becomes 'n' (I've seen this in other clues).
'hut' placed around 'n' is 'HUNT'.
(Other definitions for hunt that I've seen before include "F1 driver" , "Look high and low" , "Meeting with hounds" , "Search (with dogs?)" , "Pursue (animal) for food or sport" .)