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Plantigrade mammals a speaker’s lad puts up with (3,5)

Ross

I believe the answer is:

sun bears

'plantigrade mammals' is the definition.
(plantigrade means walking on the soles of feet)

'a speaker's lad puts up with' is the wordplay.
'a speaker's' indicates a 'sounds like' (homophone) clue.
'lad' becomes 'son' (lad can informally mean a young boy).
'puts up with' becomes 'bears' ('bear' can be a synonym of 'put up with').
'son' sounds like 'sun'.
'sun'+'bears'='SUN BEARS'

I've seen this clue in The Times.
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