Costume head of tennis used to secure success? (7)
I believe the answer is:
twinset
'costume' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'head of tennis used to secure success?' is the wordplay.
'head of' says to take the initial letters.
'used to' becomes 'set' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'secure' indicates putting letters inside (inserted letters are secured inside).
'success?' becomes 'win' (I've seen this in another clue).
The initial letter of 'tennis' is 't'.
't'+'set'='tset'
'tset' placed around 'win' is 'TWINSET'.
Can you help me to learn more?
(Other definitions for twinset that I've seen before include "Wear associated with pearls?" , "Kit worn to match" , "clothing" , "Matching cardigan and jumper worn together" , "coordinated clothes" .)