Sign meaning “free air” at some garages (5)
I believe the answer is:
aries
'sign' is the definition.
(star sign)
'free air at some garages' is the wordplay.
'free' indicates anagramming the letters.
'at' is a charade indicator (letters next to each other).
'some garages' becomes 'es' (I can't explain this - if you can you should believe this answer much more).
'air' is an anagram of 'ari'.
'ari'+'es'='ARIES'
'meaning' acts as a link.
Can you help me to learn more?
(Other definitions for aries that I've seen before include "Constellation with sign of the ram" , "Philip -, English poet" , "Sheep" , "star group" , "Zodiac ram" .)