Disguises knight in green dress every so often (7)
I believe the answer is:
encodes
'disguises' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how one could define the other.
'knight in green dress every so often' is the wordplay.
'knight' becomes 'n' (chess abbreviation).
'in' indicates putting letters inside.
'green' becomes 'eco' (abbreviation for ecological).
'every so often' indicates alternate letters.
The alternating letters of 'dress' are 'des'.
'n' placed into 'eco' is 'enco'.
'enco'+'des'='ENCODES'
Can you help me to learn more?
(Another definition for encodes that I've seen is " Encrypts".)