One gets in the bath, somehow, as a regular thing (5)
I believe the answer is:
habit
'a regular thing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'one gets in the bath somehow' is the wordplay.
'one' becomes 'i' (Roman numeral).
'gets in' means one lot of letters goes inside another.
'somehow' is an anagram indicator.
'bath' anagrammed gives 'habt'.
'i' going inside 'habt' is 'HABIT'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for habit that I've seen before include "Usual practice; garment" , "Monk's gown or custom" , "addictive practice" , "Custom, wont" , "Custom - costume" .)