Equipment right for undertaker? (7)

I believe the answer is:
tackler
'undertaker?' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'equipment right' is the wordplay.
I cannot quite understand how this works, but
'equipment' could be 'tackle' (tackle is a kind of equipment) and 'tackle' is present in the answer.
'right' could be 'r' (common abbreviation) and 'r' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for tackler that I've seen before include "Player trying to win the ball" , "One trying to get ball" , "sportsman getting stuck in?" .)
