Having had a break to take in contents of gallery, got going again (9)

'got going again' is the definition.
('started' can be a synonym for 'got going' so perhaps 'restarted' is OK for 'got going again')

'having had a break to take in contents of gallery' is the wordplay.
I cannot quite see how this works, but
'had' could be 'd' (in contractions e.g. 'I'd', 'you'd' etc) and 'd' is found within the answer.
'a' is within the answer.
'break' could be 'rest' (a rest is taking a break) and 'rest' is located in the answer.
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is present in the answer.
The remaining letters 'te' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?