One tends to worship single mother (4)
I believe the answer is:
imam
'one tends to worship' is the definition.
I can't judge whether this defines the answer.
'single mother' is the wordplay.
'single' becomes 'I' (I as in one).
'mother' becomes 'mam' (informal term for mother).
'i'+'mam'='IMAM'
Can you help me to learn more?
(Other definitions for imam that I've seen before include "Strict religious leader" , "Person leading devotions in a mosque" , "Muslim cleric" , "Moslem prayer leader" , "Man who leads prayers in a mosque" .)