WW1 admiral GI found outside Cell 1 agitated (8)

I believe the answer is:

jellicoe

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'ww1 admiral gi' is the definition.
I can't tell whether this defines the answer.

'found outside cell 1 agitated' is the wordplay.
'found' becomes 'joe' (I can't explain this - if you can you should believe this answer much more).
'outside' indicates putting letters inside.
'j' becomes 'i' ('i' can be a synonym of 'j').
'agitated' is an anagram indicator.
'cell'+'i'='celli'
'celli' anagrammed gives 'ellic'.
'joe' going around 'ellic' is 'JELLICOE'.

Can you help me to learn more?

(Another definition for jellicoe that I've seen is " First Earl -, English admiral (Jutland)".)

I've seen this clue in The Telegraph.

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