Shovel for one in suit? (5)

I believe the answer is:

spade

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This could be a double definition.

'shovel for one' is the first definition.
'spade' can be an answer for 'shovel' (I've seen this before). I am not certain of the 'for one' bit.

'suit?' is the second definition.
(playing card suit)

'in' is the link.

Can you help me to learn more?

(Other definitions for spade that I've seen before include "that has a cutting edge" , "One in a suit" , "home in Kent" , "Gardening tool (maybe so called)" , "Small shovel" .)

I've seen this clue in The Mirror.

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