Bridge player must do this to dog clothes (6,4)
I believe the answer is:
'bridge player must do this' is the definition.
The definition suggests a singular noun but the answer is not.
'dog clothes' is the wordplay.
'dog' becomes 'follow' (I've seen this before).
'clothes' becomes 'suit' (set of clothes).
'to' is the link.
Can you help me to learn more?
(Other definitions for follow suit that I've seen before include "Do the same as someone else" , "Do as others do" , "Play another club, perhaps" , "go from club to club" , "in due course" .)