Fixer full of limitless gas and wind (7)
I believe the answer is:
meander
'wind' is the definition.
('meander' can be a synonym of 'wind')
'fixer full of limitless gas' is the wordplay.
'fixer' becomes 'mender'.
'full of' is an insertion indicator.
'limitless' indicates the central letters.
The central letter of 'gas' is 'a'.
'mender' going around 'a' is 'MEANDER'.
'and' is the link.
(Other definitions for meander that I've seen before include "Wandering direction" , "roundabout route" , "an Indo-European river" , "Snake" , "Wind, bend" .)