Guides have cheese sandwiches with hint of salsa (8)

'guides' is the definition.
(Brownies are junior Girl Guides)

'have cheese sandwiches with hint of salsa' is the wordplay.
'have' becomes 'own' (to have something is to own it).
'cheese' becomes 'brie' (Brie is an example).
'sandwiches' indicates putting letters inside (goes on either side like a sandwich).
'with' is a charade indicator (letters next to each other).
'hint of' suggests taking the first letters (the smallest possible amount of the word).
The first letter of 'salsa' is 's'.
'own' going inside 'brie' is 'brownie'.
'brownie'+'s'='BROWNIES'