The thought I had for every one (4)

I believe the answer is:

idea

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'the thought' is the definition.
(idea is a kind of thought)

'i had for every one' is the wordplay.
'i had' becomes 'i'd' (contraction).
'for' says to put letters next to each other.
'every one' becomes 'ea' (I can't explain this - if you can you should believe this answer much more).
'id'+'ea'='IDEA'

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(Other definitions for idea that I've seen before include "Mental impression" , "a wheeze" , "Inkling" , "Sudden inspiration?" , "Fancy" .)

I've seen this clue in the Evening Standard.

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