Bug? There's a small number in a place over the pond (5)
I believe the answer is:
annoy
'bug?' is the definition.
(thesaurus)
'a small number in a place over the pond' is the wordplay.
'small number' becomes 'no' (abbreviation for 'number').
'in' indicates putting letters inside.
'a place over the pond' becomes 'ny' (New York).
'no' put into 'ny' is 'nnoy'.
'a'+'nnoy'='ANNOY'
'there's' acts as a link.
(Other definitions for annoy that I've seen before include "Exasperate" , "Upset" , "eat" , "Irritate, nettle" , "Irritate - pester" .)