Crossword Genius

Thin boxes, empty initially (6)

Ross

I believe the answer is:

sparse

'thin' is the definition.
(I know that thin can be written as sparse)

'boxes empty initially' is the wordplay.
'boxes' becomes 'spars' (sparring is a kind of boxing).
'initially' suggests taking the first letters.
The initial letter of 'empty' is 'e'.
'spars'+'e'='SPARSE'

(Other definitions for sparse that I've seen before include "Thinly-spread" , "Rare" , "not packed together" , "Far from lavish" , "Thinly spread" .)

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