The kind of guard to re-equip with weapons almost (4)
I believe the answer is:
rear
'the kind of guard' is the definition.
(I've seen this in another clue)
're-equip with weapons almost' is the wordplay.
'equip with weapons' becomes 'arm' (I've seen this before).
'almost' means to remove the last letter (most of the word but not all of it).
'arm' with its last letter removed is 'ar'.
're'+'ar'='REAR'
'to' is the link.
(Other definitions for rear that I've seen before include "Hitchcock film set in one room" , "Hind part" , "Foster" , "Bring up (children)" , "Posterior" .)