One is unable to tuck into beer in Spain (8)
I believe the answer is:
alicante
'in spain' is the definition.
(Spanish city)
'one is unable to tuck into beer' is the wordplay.
'one' becomes 'i' (Roman numeral).
'is unable to' becomes 'cant' (can't).
'tuck into' indicates putting letters inside.
'beer' becomes 'ale' (I've seen this before).
'i'+'cant'='icant'
'icant' inserted within 'ale' is 'ALICANTE'.
(Other definitions for alicante that I've seen before include "in Iberia" , "Spanish resort" , "European resort" , "in Spain" , "Spanish city" .)