Employed to secure luck, like a horseshoe (1-6)
I believe the answer is:
u-shaped
'like a horseshoe' is the definition.
(horseshoes are U-shaped)
'employed to secure luck' is the wordplay.
'employed' becomes 'used' ('use' can be a synonym of 'employ').
'to secure' means one lot of letters goes inside another (inserted letters are secured inside).
'luck' becomes 'hap' (I've seen this in another clue).
'used' placed around 'hap' is 'U-SHAPED'.
(Another definition for u-shaped that I've seen is " In the form of the 21st letter".)
I've seen this clue in The Times.
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