Limit relaxation, taking shower? (8)
I believe the answer is:
restrain
'limit' is the definition.
(I know that restrain is a type of limit)
'relaxation taking shower?' is the wordplay.
'relaxation' becomes 'rest' (synonyms).
'taking' says to put letters next to each other.
'shower?' becomes 'rain' (showering is a kind of raining).
'rest'+'rain'='RESTRAIN'
(Other definitions for restrain that I've seen before include "Control - check" , "use handcuffs?" , "stay" , "Prevent (from excess)" , "In arrest (anagram)" .)