Crossword Genius

Store lacks small nail (4)

Ross

I believe the answer is:

tack

I'm a little stuck... Click here to teach me more about this clue!

'small nail' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for tack that I've seen before include "vulgar" , "Drawing-pin" , "Ship's course; horse's harness" , "Stickiness" , "Turn and sail into the wind" .)

I've seen this clue in The Hindu.
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