Trapped in matted reeds, I remain (6)

I believe the answer is:

reside

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'remain' is the definition.
(thesaurus)

'trapped in matted reeds i' is the wordplay.
'reeds i' anagrams to 'RESIDE'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for reside that I've seen before include "Live (at an address)" , "Lodge" , "Hang out with" , "Dwell in desire" , "Make one's home permanently" .)

I've seen this clue in the Evening Standard.

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