Sensible to restrict access to a lot of beer (8)
I believe the answer is:
rational
'sensible' is the definition.
(associated in meaning)
'restrict access to a lot of beer' is the wordplay.
'restrict access' becomes 'ration' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to a lot of' means to remove the last letter (a lot of but not all of the word).
'beer' becomes 'ale' (type of beer).
'ale' with its last letter taken away is 'al'.
'ration'+'al'='RATIONAL'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for rational that I've seen before include "Sane; able to think" , "Having common sense or reason" , "Consistent with reason" , "Agreeable to reason" , "Based on reason or logic" .)