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A little fossil I acquired forming part of pelvis (5)

Ross

I believe the answer is:

iliac

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

'part of pelvis' is the definition.
Although both the answer and definition are adjectives, I can't see how they can define each other.

'a little fossil i acquired' is the wordplay.
'a little' indicates a hidden word.
'ILIAC' can be found hidden inside 'fossil i acquired'.

'forming' acts as a link.

Can you help me to learn more?

(Other definitions for iliac that I've seen before include "Relating to part of the hip bone" , "Trojan" , "Pertaining to hip bone" , "bottom of a hip bone" , "Like certain body parts" .)

I've seen this clue in The Everyman puzzle in The Observer.
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