Told I'm going to offshore location (4)
I believe the answer is:
isle
'offshore location' is the definition.
'isle' can be an answer for 'location' (I have seen 'Geographic location' mean 'isle' so perhaps 'location' could also mean 'isle'). I'm not sure about the 'offshore' bit.
'told i'm going to' is the wordplay.
'told' indicates a 'sounds like' (homophone) clue.
'i'm going to' becomes 'I'll' ('I'm going to' can mean 'I will' or 'I'll').
'ill' is a homophone of 'ISLE'.
Can you help me to learn more?
(Other definitions for isle that I've seen before include "Eg, Iona" , "Man's one" , "Dogs, for example" , "Lilliput, say" , "''There is an ..., a bonny ...'' (anthem of Shannon RFC)" .)