Crossword Genius

Sound recorder of a ship's course around the unfathomable deep (4,4)

Ross

I believe the answer is:

tape deck

I'm a little stuck... Click here to teach me more about this clue!

'sound recorder' is the definition.
'tape deck' can be an answer for 'recorder' (I've seen this before). I'm not certain of the 'sound' bit.

'a ship's course around the unfathomable deep' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'course' could be 'e' and 'e' is found within the answer.
'around' could be 'c' (abbreviation for 'circa') and 'c' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for tape deck that I've seen before include "Recorder" , "Drive" , "Outmoded recording machine" , "Hi-fi recording unit" .)

I've seen this clue in the Sydney Morning Herald.
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