Crossword Genius

Obvious trail grew blurred (4,5)

Ross

I believe the answer is:

writ large

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

'obvious' is the definition.
(similar in meaning)

'trail grew blurred' is the wordplay.
'trail grew' can be anagrammed to 'WRIT LARGE'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for writ large that I've seen before include "exaggerated" , "on a mass scale" , "Emphasised" , "very obvious" .)

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