Crossword Genius

Like a point to concentrate on (5)

Ross

I believe the answer is:

focal

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'on' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for focal that I've seen before include "sort of length" , "Of the point of convergence" , "Relating to a central point of interest" , "Things are concentrated at such a point" , "and 21 Across: Centre of attraction" .)

I've seen this clue in The Globe and Mail.
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