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Free energy engaging Kelvin’s observation (4-3)

Ross

I believe the answer is:

look-see

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'observation' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'free energy engaging kelvin's' is the wordplay.
'free' becomes 'loose' (synonyms).
'energy' becomes 'e' (physics symbol as in E=mc2).
'engaging' indicates putting letters inside.
'kelvin' becomes 'K' (abbreviation for the unit of temperature).
'loose'+'e'='loosee'
'loosee' going around 'k' is 'LOOK-SEE'.

Can you help me to learn more?

(Other definitions for look-see that I've seen before include "Young's - relates stress and strain (Physics)" , "Survey, inspection" , "Brief inspection" , "Inspection (colloq.)" , "Dekko" .)

I've seen this clue in The Independent.
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