Crossword Genius

No longer trendy: lot had changed (3,3)

Ross

I believe the answer is:

old hat

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

'no longer trendy' is the definition.
I can't tell whether this definition defines the answer.

'lot had changed' is the wordplay.
'changed' is an anagram indicator.
'lot'+'had'='lothad'
'lothad' anagrammed gives 'OLD-HAT'.

Can you help me to learn more?

(Other definitions for old hat that I've seen before include "Out-of-date" , "Something out of date" , "Stale - out of date" , "Out of fashion, like ancient headgear" , "On the way out" .)

I've seen this clue in The Sun.
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