Suit in which a bit of padding is used (6)
I believe the answer is:
spades
'suit in which a bit of padding is used' is the definition.
'spades' can be an answer for 'suit' (playing card suit). I'm unsure of the remainder of the definition.
'suit in which' is the wordplay.
'suit' becomes 'spade' (playing card suit).
'in which' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'spade'+'s'='SPADES'
Can you help me to learn more?
(Other definitions for spades that I've seen before include "They may turn up" , "One of two black suits" , "Passed around with diggers" , "Card suit and sturdy shovels" , "trumps sometimes" .)