Stripping off, assistant crime-fighter breaks gun out (8)

I believe the answer is:

unrobing

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

'stripping' is the definition.
(I've seen this before)

'off assistant crime-fighter breaks gun out' is the wordplay.
'off assistant crime fighter' becomes 'robin' (I can't explain this - if you can you should believe this answer much more).
'breaks' indicates an anagram.
'out' indicates putting letters inside.
'gun' with letters rearranged gives 'ung'.
'robin' put inside 'ung' is 'UNROBING'.

Can you help me to learn more?

(Another definition for unrobing that I've seen is " Stripping".)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app