Coach takes on more money (5)
I believe the answer is:
bonus
'more money' is the definition.
'bonus' can be an answer for 'money' (I have seen 'extra money' mean 'bonus' so perhaps 'money' could also mean 'bonus'). I'm unsure of the 'more' bit.
'coach takes on' is the wordplay.
'coach' becomes 'bus' (synonyms).
'takes' indicates putting letters inside.
'bus' placed around 'on' is 'BONUS'.
Can you help me to learn more?
(Other definitions for bonus that I've seen before include "Money on top of wages or salary" , "Extra payment - reward" , "Something more than you expected" , "Extra payment for good results" , "Additional payment to encourage productivity" .)