In case of feud one coach for club with two mugs? (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Insertion of ACE + CAR inside FD (‘case of F eu D ‘), the definition referring to the reversible figures on playing cards, with the question mark because it’s a definition by example – it might equally apply to a spade, diamond or heart as a club