Former lady's maid advanced with considerable trouble (7)

I believe the answer is:

abigail

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'former lady's maid' is the definition.
'abigail' can be an answer for 'maid' (I've seen this before). I am unsure of the 'former lady's' bit.

'advanced with considerable trouble' is the wordplay.
'advanced' becomes 'a' (abbreviation).
'with' says to put letters next to each other.
'considerable' becomes 'big'.
'trouble' becomes 'ail' (synonyms).
'a'+'big'+'ail'='ABIGAIL'

Can you help me to learn more?

(Other definitions for abigail that I've seen before include "Woman" , "She served David" , "lady!" , "Girl's name" , "Woman's name - old lady's maid" .)

I've seen this clue in The Telegraph.

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