Wet and muddy planet hastily vacated (6)

I believe the answer is:

marshy

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'wet' is the definition.
(similar in meaning)

'muddy planet hastily vacated' is the wordplay.
'muddy planet' becomes 'mars' (Mars is a planet. I am not sure about the 'muddy' bit.).
'vacated' means to remove the middle letters.
'hastily' with its centre removed is 'hy'.
'mars'+'hy'='MARSHY'

'and' is the link.

Can you help me to learn more?

(Other definitions for marshy that I've seen before include "Boggy, swampy" , "Wet and low-lying" , "Soggy" , "(Of ground) wet" , "Like swamps" .)

I've seen this clue in The Times and The Sun.

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