Bow adjuster changed for good (4)

I believe the answer is:

frog

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'bow adjuster' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'changed for good' is the wordplay.
'changed' indicates anagramming the letters.
'good' becomes 'g' (abbreviation).
'for' is an anagram of 'fro'.
'fro'+'g'='FROG'

Can you help me to learn more?

(Other definitions for frog that I've seen before include "eg Kermit" , "Amphibian - depression in brick" , "Small creature" , "fastener" , "in grass?" .)

I've seen this clue in The Guardian.

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