In seconds, posh wine is protected (7)
I believe the answer is:
insured
'protected' is the definition.
(insuring is a kind of protecting)
'in seconds posh wine' is the wordplay.
'seconds' becomes 's'.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'wine' becomes 'red' (red is a type of wine).
'in'+'s'+'u'+'red'='INSURED'
'is' acts as a link.
(Other definitions for insured that I've seen before include "Covered for losses" , "Financially covered" , "Covered, maybe against damage to 23 ..." , "Covered for loss" , "Covered against mishaps" .)