Extremely important parts of the body (5,3,4)

I believe the answer is:

hands and feet

I'm a little stuck... Click here to teach me more about this clue!

'extremely important' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'parts of the body' is the wordplay.
I cannot really understand how this works, but
'parts' could be 'hands' (hand is a kind of part) and 'hands' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.