French article expected to be disproportionate (5)
I believe the answer is:
undue
'be disproportionate' is the definition.
(I've seen this in another clue)
'french article expected' is the wordplay.
'french article' becomes 'un' (indefinite article in French).
'expected' becomes 'due' (similar in meaning).
'un'+'due'='UNDUE'
'to' acts as a link.
(Other definitions for undue that I've seen before include "Improper" , "Needless; excessive" , "Extreme" , "Not warranted" , "Beyond normal limits" .)