20 across
A
period
in
prison,
volunteers
once
joining
in
with
difficulty
(2,1,7)
A period in prison, volunteers once joining in with difficulty (2,1,7)
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The definition is at the end of the clue.
How the clue works
Look at with difficulty — that's your definition. You've got A, then TA (the Territorial Army, the old volunteers, "joining in"), then STRETCH (a period in prison), and put them all together and you've got your answer.