Large diamonds missing from a wedding ring after repairs (4-7)
I believe the answer is:
wide-ranging
'large' is the definition.
('wide-ranging' can be similar in meaning to 'large')
'diamonds missing from a wedding ring after repairs' is the wordplay.
'diamonds' becomes 'd' (abbreviation in bridge say).
'missing from' suggests deleting specific letters.
'after' says to put letters next to each other.
'repairs' indicates an anagram (I've seen 'repair' mean this).
'a'+'wedding'='awedding'
'awedding' with 'd' taken out is 'aweding'.
'aweding'+'ring'='awedingring'
'awedingring' is an anagram of 'WIDE-RANGING'.
(Another definition for wide-ranging that I've seen is " Covering a large area".)