Crossword Genius

Your money's worth giving for tea clue? (4,2,8)

Ross

I believe the answer is:

rate of exchange

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

'your money's worth' is the definition.

'giving for tea clue?' is the wordplay.
'giving' indicates an anagram (the letters give the letters for another word).
'clue?' becomes 'exchange' (I am not sure about this - if you are sure you should believe this answer much more).
'for'+'tea'='fortea'
'fortea' anagrammed gives 'rateof'.
'rateof'+'exchange'='RATE OF EXCHANGE'

Can you help me to learn more?

(Other definitions for rate of exchange that I've seen before include "Get it for a few pounds" , "speed one bargains?" .)

I've seen this clue in The Guardian.
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