Autumn pleases somehow and goes off (5,6)

I believe the answer is:

falls asleep

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'goes off' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how one could define the other.

'autumn pleases somehow' is the wordplay.
'autumn' becomes 'fall' (synonyms).
'somehow' indicates an anagram.
'pleases' is an anagram of 'sasleep'.
'fall'+'sasleep'='FALLS ASLEEP'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Mirror.

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