Woolly pack covers dressing for arm

I believe the answer is:

flintlock

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

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

'woolly pack covers dressing' is the wordplay.
'woolly pack' becomes 'flock' (I can't justify this - if you can you should give a lot more credence to this answer).
'covers' indicates putting letters inside.
'dressing' becomes 'lint' (I've seen this before).
'flock' enclosing 'lint' is 'FLINTLOCK'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for flintlock that I've seen before include "gun" , "Piece of old" , "Old-fashioned firearm" , "one was fired" , "Type of firearm" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.