Father during betting is very careful (11)
I believe the answer is:
painstaking
'very careful' is the definition.
'painstaking' can be an answer for 'careful' ('painstaking' can be similar in meaning to 'careful'). I'm not certain of the 'very' bit.
'father during betting' is the wordplay.
'father' becomes 'pa' (pa is a kind of father).
'during' becomes 'in' (I've seen this in other clues).
'betting' becomes 'staking' (staking is a kind of betting).
'pa'+'in'+'staking'='PAINSTAKING'
'is' is the link.
Can you help me to learn more?
(Other definitions for painstaking that I've seen before include "Assiduous, thorough" , "Extremely careful" , "using great care" , "Diligent, scrupulous" , "Laboriously careful" .)