Crossword Genius

Line a bin up for this regular event (8)

Ross

I believe the answer is:

biennial

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'this regular event' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

'line a bin up' is the wordplay.
'up' indicates anagramming the letters (letters get chucked up).
'line'+'a'+'bin'='lineabin'
'lineabin' is an anagram of 'BIENNIAL'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for biennial that I've seen before include "Plant with a two-year life cycle" , "Happening every second year" , "Plant living two years" , "Taking place every other year" , "Two-yearly" .)

I've seen this clue in the Sydney Morning Herald.
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