Crossword Genius

Lean pigs mucked up, seen in passing (8)

Ross

I believe the answer is:

elapsing

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

'passing' is the definition.
('elapse' can be a synonym of 'pass')

'lean pigs mucked up seen' is the wordplay.
'lean pigs' anagrams to 'ELAPSING'.
However, I am unsure how the anagram is indicated.

'in' acts as a link.

Can you help me to learn more?

(Another definition for elapsing that I've seen is " Passing, as time".)

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