Crossword Genius

Pack animal has problem with tendon (8)

Ross

I believe the answer is:

ganglion

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

'problem with tendon' is the definition.
I can't judge whether this definition defines the answer.

'pack animal' is the wordplay.
'pack' becomes 'gang' (synonyms).
'animal' becomes 'lion' (I've seen this before).
'gang'+'lion'='GANGLION'

'has' is the link.

Can you help me to learn more?

(Other definitions for ganglion that I've seen before include "Nerve centre" , "Swelling" , "centre of interest" , "Collection of nerve cells" , "A longing for group of nerve cells" .)

I've seen this clue in The Sun.
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