Increase dispersal of mutagen (7)

I believe the answer is:

augment

'increase' is the definition.
(I know that augment is a type of grow)

'dispersal of mutagen' is the wordplay.
'dispersal of' is an anagram indicator (I've seen this in other clues).
'mutagen' with letters rearranged gives 'AUGMENT'.

(Other definitions for augment that I've seen before include "Make greater in size, number, etc." , "Enlarge or increase" , "Grow - intensify" , "Increase number of" , "Expand" .)

I've seen this clue in The Guardian.

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