Film wrapped by Gervais perhaps is likely to fall flat (7)
I believe the answer is:
rickety
'is likely to fall flat' is the definition.
I can't judge whether this defines the answer.
'film wrapped by gervais' is the wordplay.
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'wrapped by' indicates putting letters inside (inserted letters get wrapped up).
'gervais' becomes 'ricky' (I am not sure about this - if you are sure you should believe this answer much more).
'et' placed into 'ricky' is 'RICKETY'.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for rickety that I've seen before include "Likely to collapse" , "Unstable" , "liable to collapse" , "Unsteady" , "Shaky" .)