Welsh leader, sick, uttering plaintive cries (7)

I believe the answer is:

wailing

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'uttering plaintive cries' is the definition.
'wailing' can be an answer for 'uttering' (wailing is a kind of uttering). I'm unsure of the 'plaintive cries' bit.

'welsh leader sick' is the wordplay.
'leader' says to take the initial letters.
'sick' becomes 'ailing' (similar in meaning).
The initial letter of 'welsh' is 'w'.
'w'+'ailing'='WAILING'

Can you help me to learn more?

(Other definitions for wailing that I've seen before include "Jerusalem site sacred to Jews for prayer and lamentation" , "Greeting" .)

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