Binge dropping ecstasy periodically and space out (6)

I believe the answer is:

spread

I'm a little stuck... Click here to teach me more about this clue!

'space out' is the definition.
'spread' can be an answer for 'space' (thesaurus). I am not certain of the 'out' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for spread that I've seen before include "Open, fan out, unfold" , "Rancher's property - sumptuous meal" , "Extent; elaborate meal" , "Disseminate through padres" , "Broaden - drapes (anag)" .)

I've seen this clue in The Independent.

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