Crossword Genius

Dating? Must grab apartment at top speed … (5,4,3)

Ross

I believe the answer is:

going flat out

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

'at top speed' is the definition.
(going flat out means going as fast as possible)

'dating? must grab apartment' is the wordplay.
I cannot quite understand how this works, but
'apartment' could be 'flat' (synonyms) and 'flat' is present in the answer.
'dating?' could be 'goingout' (as in dating or going out with someone) and 'goingout' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
Want a hint initially instead of a full solution? Install my app