Fashion line for one on catwalk (5)
I believe the answer is:
model
'fashion' is the definition.
(I've seen this before)
'line for one on catwalk' is the wordplay.
'line' becomes 'el' (el is a kind of line).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'one on catwalk' becomes 'mod' (I can't justify this - if you can you should believe this answer much more).
'el' put after 'mod' is 'MODEL'.
Can you help me to learn more?
(Other definitions for model that I've seen before include "Poser for painter or photographer" , "A displayer of fashions" , "Pattern" , "Representative example" , "Exemplary - mannequin" .)