Crossword Genius

Secret store of headgear used up round start of spring (5)

Ross

I believe the answer is:

stash

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

'secret store' is the definition.
(I've seen this before)

'headgear used up round start of spring' is the wordplay.
'headgear' becomes 'hat' (hat is a kind of headgear).
'used' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'up' is a reversal indicator (in down clue: letters go upwards).
'round' means one lot of letters goes inside another.
'start of' suggests taking the first letters.
The initial letter of 'spring' is 's'.
'hat'+'s'='hats'
'hats' backwards is 'stah'.
'stah' going around 's' is 'STASH'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for stash that I've seen before include "drug store" , "(Hidden store of) drugs" , "Secret store of valuables" , "Hide (something) away" , "Secret(ly) store" .)

I've seen this clue in The Telegraph.
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