Suit a Scottish soccer side (6)
I believe the answer is:
hearts
'suit a scottish soccer side' is the definition.
'hearts' can be an answer for 'suit' (hearts is a playing card suit). I'm unsure of the 'a scottish soccer side' bit.
'suit a scottish' is the wordplay.
'suit' becomes 'heart'.
'a scottish' becomes 's' (this might be a standard abbreviation of which I'm unaware).
'heart'+'s'='HEARTS'
Can you help me to learn more?
(Other definitions for hearts that I've seen before include "Playing-card suit" , "Edinburgh football team - suit" , "Central parts" , "Cores" , "Red playing cards" .)