Arm better, if leg's bandaged (5)

I believe the answer is:

rifle

I'm a little stuck... Click here to teach me more about this clue!

'arm' is the definition.
(rifle is a kind of arm)

'better if leg's bandaged' is the wordplay.
'RIFLE' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for rifle that I've seen before include "strip bare?" , "Steal and carry off - firearm" , "Go through in search" , "Firearm - plunder" , "Standard military gun fired from shoulder" .)

I've seen this clue in The Guardian.

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