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1. Small units cracked crimes around city, ending in arrest (11) ??C???????S
2. One senile chap's excited when meeting the Queen - an oldie in uniform (7,9)N is the 3rd letter of the second word!
3. Sort of collector to show irritability when faced with debtor (6)D?????
Any help please!!

2. Chelsea pensioner

3. Dredge (?)

Small units cracked crimes around city, ending in arrest (11) ??C???????S

crimes+city(ROME)+ending in arres(T)

Micrometers - small unit ( one millionth of a metre)

sorry - mis spelling should read

micrometres

I had put micrometer which is incorrect as that is a guage for measuring small distance.