Some oyster nets back on a boat (5)

I believe the answer is:

stern

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

'back on a boat' is the definition.
'stern' can be an answer for 'back' (stern means the back of a boat). I am not sure about the 'on a boat' bit.

'some oyster nets' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'STERN' is hidden within 'oyster nets'.

Can you help me to learn more?

(Other definitions for stern that I've seen before include "Inflexible; back" , "Unyielding - rump" , "Severe part of the ship?" , "Authoritarian, back" , "Rear; severe, serious" .)

I've seen this clue in The Daily Express.

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