The other rat I can see is partly unpredictable (7)

I believe the answer is:

erratic

'unpredictable' is the definition.
(synonyms)

'the other rat i can see is partly' is the wordplay.
'see is partly' indicates the answer is hidden within the clue (part of the clue is used).
'ERRATIC' is hidden in the letters of 'other rat i can'.

(Other definitions for erratic that I've seen before include "Variable" , "Inconstant" , "Mercurial" , "Unpredictable - car tire (anag)" , "Changeable" .)

I've seen this clue in The Irish News.

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