Delicate feminine line (5)

I believe the answer is:

frail

'delicate' is the definition.
('frail' can be a synonym of 'delicate')

'feminine line' is the wordplay.
'feminine' becomes 'f' (abbreviation listed in Chambers).
'line' becomes 'rail' (I've seen this before**).
'f'+'rail'='FRAIL'

(Other definitions for frail that I've seen before include "Weak, feeble" , "Physically feeble" , "Slight" , "Feeble - basket" , "Physically weak, delicate" .)

I've seen this clue in The Telegraph.

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