Remarkable additional routine (13)

I believe the answer is:

extraordinary

'remarkable' is the definition.
('extraordinary' can be similar in meaning to 'remarkable')

'additional routine' is the wordplay.
'additional' becomes 'extra' (I've seen this before).
'routine' becomes 'ordinary' ('ordinary' can be similar in meaning to 'routine').
'extra'+'ordinary'='EXTRAORDINARY'

(Other definitions for extraordinary that I've seen before include "Exceptional" , "Phenomenal" , "Remarkable - abnormal" , "Highly unusual" .)

I've seen this clue in The Times.

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