Just less than a shilling to look after? (4)

I believe the answer is:

tend

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'look after?' is the definition.
(tending is a kind of looking after)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tend that I've seen before include "Minister" , "See to" , "Incline, lean" , "Look after - there's a dent in it" , "Wait on" .)

I've seen this clue in The Times.

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