Dance energetically, then become depressed (3,4)

I believe the answer is:

get down

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'dance energetically' is the definition.
'get down' can be an answer for 'dance' (get down can mean to dance or party). I am not sure about the 'energetically' bit.

'then become depressed' is the wordplay.
'then' means one lot of letters go next to another.
'become' becomes 'get' (synonyms).
'depressed' becomes 'down' (synonyms).
'get'+'down' is 'GET DOWN'.

Can you help me to learn more?

(Other definitions for get down that I've seen before include "you could - from duck" , "See feathers, > alight" , "Dismount, alight" , "Swallow" .)

I've seen this clue in The Daily Express.

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