English Navy wearing uniform with identical form of ID (8)
I believe the answer is:
username
'form of id' is the definition.
I know nothing about this answer so I can't tell whether this works.
'english navy wearing uniform with identical' is the wordplay.
'english' becomes 'E' (abbreviation).
'navy' becomes 'RN' (abbreviation for Royal Navy).
'wearing' indicates putting letters inside.
'uniform with' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.. I am not sure about the 'with' bit.).
'identical' becomes 'same' (similar in meaning).
'e'+'rn'='ern'
'u'+'same'='usame'
'ern' going inside 'usame' is 'USERNAME'.
Can you help me to learn more?
(Other definitions for username that I've seen before include "Person's computer ID" , "One's identifier on a computer" , "Login ID" , "Something needed for logging in" , "Online identity" .)