Spell with a session of golf and time needed to meet deadline (10)

I believe the answer is:

turnaround

I'm a little stuck... Click here to teach me more about this clue!

'golf and time needed to meet deadline' is the definition.
I can't judge whether this definition defines the answer.

'spell with a session' is the wordplay.
'spell' becomes 'turn' (synonyms).
'with' says to put letters next to each other.
'session' becomes 'round' (I've seen this before).
'turn'+'a'+'round'='TURNAROUND'

'of' acts as a link.

Can you help me to learn more?

(Another definition for turnaround that I've seen is " Unexpected change".)

I've seen this clue in The Guardian.

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