Number the German offer (6)
I believe the answer is:
tender
'offer' is the definition.
(tender can mean to offer something)
'number the german' is the wordplay.
'number' becomes 'ten' (ten is a kind of whole number).
'the german' becomes 'der' ('the' in German).
'ten'+'der'='TENDER'
(Other definitions for tender that I've seen before include "'Soft, sensitive offer? (6)'" , "Rented (anag.)" , "Painful to the touch" , "Bill from Avon's beloved" , "Not hardy (but it may be legal)" .)