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Lurch let race trail lead of Uncle Fester (8)

Ross

I believe the answer is:

ulcerate

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

'lurch' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.

'let race trail lead of uncle fester' is the wordplay.
'trail' means one lot of letters go next to another.
'lead of' suggests taking the first letters (I've seen 'leading' mean this).
'fester' indicates anagramming the letters (I've seen 'festering' mean this).
The first letter of 'uncle' is 'u'.
'let'+'race'='letrace'
'letrace' put after 'u' is 'uletrace'.
'uletrace' is an anagram of 'ULCERATE'.

Can you help me to learn more?

(Other definitions for ulcerate that I've seen before include "Become inflamed and infected" , "Erupt into sores" , "Form open sore" , "Become affected by open sores -- late cure (anag)" .)

I've seen this clue in the Sydney Morning Herald.
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