Easily damaged if lager flowing (7)
I believe the answer is:
fragile
'easily damaged' is the definition.
(I've seen this before)
'if lager flowing' is the wordplay.
'flowing' indicates anagramming the letters.
'if'+'lager'='iflager'
'iflager' anagrammed gives 'FRAGILE'.
(Other definitions for fragile that I've seen before include "Brittle" , "Delicate, tenuous" , "Liable to break easily" , "Breakable" , "Easily-damaged" .)