Constituents of Ely -- Labour? Rather a shade Tory (5,4)

I believe the answer is:

royal blue

I'm a little stuck... Click here to teach me more about this clue!

'rather a shade tory' is the definition.
I can't tell whether this defines the answer.

'constituents of ely labour?' is the wordplay.
'constituents of' indicates an anagram.
'ely'+'labour'='elylabour'
'elylabour' is an anagram of 'ROYAL BLUE'.

Can you help me to learn more?

(Other definitions for royal blue that I've seen before include "Dark colour" , "Deep rich shade of colour" , "Bally euro (anag.)" , "(Regal?) colour" , "Your be-all (anag) - shade" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app