One offer describes reference found in same text (4)
I believe the answer is:
ibid
'reference found in same text' is the definition.
The definition suggests a singular noun which matches the answer.
'one offer' is the wordplay.
'one' becomes 'i' (Roman numeral).
'offer' becomes 'bid' (bid is a kind of offer).
'i'+'bid'='IBID'
'describes' acts as a link.
Can you help me to learn more?
(Other definitions for ibid that I've seen before include "(With written references) in the same place (Latin)" , "'In the same place as previously mentioned, in short (4)'" , "In brief, notation meaning in came book or passage" , "(When citing a reference) in the same place (abbr)" , "In the same place (Latin abbr)" .)