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Making good progress over puzzle finally — tend to be a far from lateral thinker (3-5,4)

Ross

I think it could be either:

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3-5,4

3,5

one-track mind

'a far from lateral thinker' is the definition.

'making good progress over puzzle finally tend to' is the wordplay.
'making good progress' becomes 'ontrack'.
'over' means one lot of letters goes inside another.
'finally' indicates one should take the final letters.
'tend to' becomes 'mind'.
The last letter of 'puzzle' is 'e'.
'ontrack' enclosing 'e' is 'onetrack'.
'onetrack'+'mind'='ONE-TRACK MIND'

'be' is the link.

(Other definitions for one-track mind that I've seen before include "Obsession with a single objective" , "Brain preoccupied with a single subject" , "A very limited thinker?" , "Obsessive attitude to a subject" , "Very basic obsession?" .)

I've seen this clue in The Guardian.
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