Crossword Genius

Abrupt decline, possibly becoming erratic (13)

Ross

I believe the answer is:

unpredictable

'erratic' is the definition.
('unpredictable' can be a synonym of 'erratic')

'abrupt decline possibly' is the wordplay.
'possibly' is an anagram indicator.
'abrupt'+'decline'='abruptdecline'
'abruptdecline' with letters rearranged gives 'UNPREDICTABLE'.

'becoming' acts as a link.

(Other definitions for unpredictable that I've seen before include "Capricious" , "erratic" , "Changeable" .)

I've seen this clue in The Telegraph.
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