Primates etc intend to reflect when caught in moral lapses (7)

'primates etc' is the definition.
(simians are apes or monkeys)

'intend to reflect when caught in moral lapses' is the wordplay.
'intend' becomes 'aim' (aiming is a kind of intending).
'to reflect' is a reversal indicator.
'when caught in' is an insertion indicator.
'moral lapses' becomes 'sins' (a sin is a moral lapse or failing).
'aim' written backwards gives 'mia'.
'mia' going within 'sins' is 'SIMIANS'.