One offer in the same place (4)
I believe the answer is:
ibid
'in the same place' is the definition.
(I've seen this before)
'one offer' is the wordplay.
'one' becomes 'i' (Roman numeral).
'offer' becomes 'bid' (synonyms).
'i'+'bid'='IBID'
(Other definitions for ibid that I've seen before include "Briefly, in the same book or passage" , "In the same place (Latin abbr)" , "In the same place (L)" , "In brief, notation meaning in came book or passage" , "(When citing a reference) in the same place (abbr)" .)