Thought right choice has to include head of finance (10)

I believe the answer is:

reflection

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'thought' is the definition.
(I know that reflection is a type of consideration)

'right choice has to include head of finance' is the wordplay.
'right' becomes 'r' (common abbreviation).
'choice has' becomes 'election' (I can't justify this - if you can you should give a lot more credence to this answer).
'to include' means one lot of letters goes inside another.
'head of' indicates taking the first letters.
The first letter of 'finance' is 'f'.
'election' placed around 'f' is 'eflection'.
'r'+'eflection'='REFLECTION'

Can you help me to learn more?

(Other definitions for reflection that I've seen before include "Mirror image" , "Effect of not absorbing light" , "mental study's required" , "serious thought?" .)

I've seen this clue in The Telegraph.

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