Crossword Genius

Throw in a diamond as sales talk (5)

Ross

I believe the answer is:

pitch

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

This might be a double definition.

'throw in a diamond' is the first definition.
'pitch' can be an answer for 'throw' (pitch is a kind of throw). I am not sure about the 'in a diamond' bit.

'sales talk' is the second definition.
(synonyms)

'as' acts as a link.

Can you help me to learn more?

(Other definitions for pitch that I've seen before include "To throw; roof slope" , "-- and putt" , "Scene of game (don't touch it!)" , "Distillation of tars" , "Tone - football field" .)

I've seen this clue in The Globe and Mail.
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