Rile an iffy ensemble who are completely one-dimensional (6)

I believe the answer is:

linear

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'one-dimensional' is the definition.
(I know that one-dimensional can be written as linear)

'rile an iffy' is the wordplay.
'iffy' indicates anagramming the letters.
'rile'+'an'='rilean'
'rilean' anagrammed gives 'LINEAR'.

'ensemble who are completely' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for linear that I've seen before include "Consisting of lines" , "Nailer (anag.)" , "Straight; sequential" , "-- Motor; -- equation" , "Involving one dimension only" .)

I've seen this clue in The Irish Times.

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