Seem happy, swimming in slime! (5)
I believe the answer is:
smile
'seem' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
'happy swimming in slime' is the wordplay.
'slime' can be anagrammed to 'SMILE'.
Though, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for smile that I've seen before include "Happy facial expression" , "Friendly facial gesture" , "Look happy" , "Pleased expression" , "Show pleasure in slime" .)