Like the mushrooms I had for sheer pleasure on leave (7)
I believe the answer is:
fungoid
'like the mushrooms' is the definition.
I can't judge whether this definition defines the answer.
'i had for sheer pleasure on leave' is the wordplay.
'i had' becomes 'I'd' (contraction).
'for' says to put letters next to each other (I've seen this in other clues).
'sheer pleasure' becomes 'fun' (I've seen this in other clues. I am not sure about the 'sheer' bit.).
'on' means one lot of letters go next to another.
'leave' becomes 'go' (to go is to depart or leave).
'fun'+'go'='fungo'
'id' after 'fungo' is 'FUNGOID'.
Can you help me to learn more?
(Another definition for fungoid that I've seen is " Like, eg, mushrooms".)