Crossword Genius

Yearn to find expression that's not a flash in the pan (4,4)

Ross

I believe the answer is:

long term

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

'not a flash in the pan' is the definition.
I can't tell whether this definition defines the answer.

'yearn to find expression' is the wordplay.
'yearn' becomes 'long-' (synonyms).
'to find' is a charade indicator (letters next to each other).
'expression' becomes 'term' (I've seen this in other clues).
'long'+'term'='LONG-TERM'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for long term that I've seen before include "teachers may find exhausting" , "Such future planning" .)

I've seen this clue in The Daily Express.
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