Perfect day achieved with leader sacked, one superior (9)
I believe the answer is:
idealised
'superior' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes define each other.
'perfect day achieved with leader sacked one' is the wordplay.
I cannot really see how this works, but
'perfect' could be 'ideal' ('ideal' can be similar in meaning to 'perfect') and 'ideal' is found in the answer.
'day' could be 'd' and 'd' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
The remaining letters 'se' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?