Possible Clues:

• Tree feller, one working for council
• Councillor stupidly alarmed? Not at first
• Old town council member planting tree on island
• Area let initially to the foreign chap on the English council
• Nuts learn with mad senior citizen
• Civic dignitary planting tree on island
• City of London ward councillor
• London councillor plants tree on isle
• Official chap with less on top? Not at first
• Councillor alarmed has to change name