Quite surprised — Tottenham winger during season abroad showing good form (9)
I believe the answer is:
etiquette
'good form' is the definition.
(thesaurus)
'quite surprised tottenham winger during season abroad' is the wordplay.
'surprised' indicates an anagram.
'winger' says to take the initial letters (one side or wing of the word).
'during' is an insertion indicator.
'season abroad' becomes 'ete' ('summer' in French).
The first letter of 'tottenham' is 't'.
'quite' anagrammed gives 'tique'.
'tique'+'t'='tiquet'
'tiquet' going within 'ete' is 'ETIQUETTE'.
'showing' is the link.
(Other definitions for etiquette that I've seen before include "Protocol" , "Conventions of courtesy" , "What's done" , "Code of politeness" , "Behavioural rules" .)