Supple Italian wine first to cork after the Spanish (7)
I believe the answer is:
elastic
'supple' is the definition.
(thesaurus)
'italian wine first to cork after the spanish' is the wordplay.
'italian wine' becomes 'asti' (I've seen this before).
'first to' says to take the initial letters.
'after' says to put letters next to each other.
'the spanish' becomes 'el' (**).
The first letter of 'cork' is 'c'.
'asti'+'c'='astic'
'astic' put after 'el' is 'ELASTIC'.
(Other definitions for elastic that I've seen before include "'Flexible, springy (7)'" , "Laciest (anag.)" , "Flexible, adaptable" , "Variable" , "Pliable" .)