State of bog irritated my rash (6)

I believe the answer is:

marshy

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'state of bog' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'irritated my rash' is the wordplay.
'irritated' indicates an anagram (letters disturbed or irritated).
'my'+'rash'='myrash'
'myrash' anagrammed gives 'MARSHY'.

Can you help me to learn more?

(Other definitions for marshy that I've seen before include "Like fenlands" , "(Of ground) wet" , "treacherous underfoot" , "Bog-like" , "Like swamps" .)

I've seen this clue in The Independent.

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