Reasonable, getting grip oddly in pub (7)
I believe the answer is:
logical
'reasonable' is the definition.
('logical' can be similar in meaning to 'reasonable')
'grip oddly in pub' is the wordplay.
'oddly' means one should take alternating letters.
'in' is an insertion indicator.
'pub' becomes 'local' (I've seen this before).
The alternate letters of 'grip' are 'gi'.
'gi' inserted into 'local' is 'LOGICAL'.
'getting' is the link.
(Other definitions for logical that I've seen before include "entirely reasonable" , "having good reason" , "Correctly thought out" , "'Rational, coherent (7)'" , "Deducible" .)