Cost-effective peach going bad (5)

I believe the answer is:

cheap

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

'bad' is the definition.
(thesaurus)

'cost-effective peach going' is the wordplay.
'peach' anagrams to 'CHEAP'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for cheap that I've seen before include "Budget -cheesy" , "good value" , "bargain" , "A snip" , "Inexpensive or tasteless" .)

I've seen this clue in The Sun.

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