A press release that’s pretty thin? (6)

I believe the answer is:

sparse

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

'thin?' is the definition.
('sparse' can be a synonym of 'thin')

'a press release that's pretty' is the wordplay.
'a press' can be anagrammed to 'SPARSE'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sparse that I've seen before include "Spares, being thin on the ground" , "Scarce like thinning hair" , "rarely occurring" , "Not much" , "Thinly spread" .)

I've seen this clue in the Evening Standard.

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