Graduate goes by London Underground - electronics not showing - one needs a plug (7)
I believe the answer is:
bathtub
'one needs a plug' is the definition.
I can't tell whether this defines the answer.
'graduate goes by london underground electronics not' is the wordplay.
'graduate goes by' becomes 'ba' (I can't justify this - if you can you should give a lot more credence to this answer).
'london underground' becomes 'thetube' (I've seen this in another clue).
'electronics' becomes 'ee' (two E's - as in E-mail).
'not' suggests deleting specific letters.
'thetube' with 'ee' removed is 'thtub'.
'ba'+'thtub'='BATHTUB'
'showing' is the link.
Can you help me to learn more?
(Other definitions for bathtub that I've seen before include "where one gets into hot water" , "Vessel for ablutions" , "Film made by soap" , "that may need a plug" , "Where to come clean" .)