In US, marshy spot in inlet not wholly dismissed (5)
I believe the answer is:
bayou
'in us marshy spot' is the definition.
I can't tell whether this definition defines the answer.
'inlet not wholly dismissed' is the wordplay.
'inlet' becomes 'bay' (I've seen this before).
'not wholly' means to remove the last letter.
'dismissed' becomes 'out' (dismissed in cricket).
'out' with its last letter taken away is 'ou'.
'bay'+'ou'='BAYOU'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bayou that I've seen before include "Swamp in Louisiana etc" , "nickname of US State" , "bit of wetland in Texas, eg" , "Marshy outlet" , "US outlet" .)