Massive beast in courtship position (5)

I believe the answer is:

hippo

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

'massive beast' is the definition.
'hippo' can be an answer for 'beast' (I've seen this before). I am unsure of the 'massive' bit.

'in courtship position' is the wordplay.
'in' says the answer is hidden in the clue.
'HIPPO' is hidden within 'courtship position'.

Can you help me to learn more?

(Other definitions for hippo that I've seen before include "African wallower (abbr)" , "Large animal" , "Aquatic creature" , "Tropical African mud wallower" , "Afr. river mammal" .)

I've seen this clue in The Sun.

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