Settle on tubers, twisted at the end (5)

I believe the answer is:

roost

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'settle on tubers' is the definition.
'roost' can be an answer for 'settle' (I've seen this before). I'm unsure of the 'on tubers' bit.

'twisted at the end' is the wordplay.
'twisted' becomes 'roos' (I am not sure about this - if you are sure you should believe this answer much more).
'the end' suggests the final letters.
The final letter of 'at' is 't'.
'roos'+'t'='ROOST'

Can you help me to learn more?

(Other definitions for roost that I've seen before include "Glowing with joy" , "(Of birds) settle for rest" , "Hen house; perch" , "Rest on a perch" , "Temporary resting-place" .)

I've seen this clue in The Telegraph.

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